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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bb2f25996f24bd0f281b79b803080881cab8f6aee10a4a1ccfbc6f1deb90aa9' 
  AND token = 'S3dnMFK/ht+/21Cu3WFYTeolTqefGiNAj/SmpNf+j6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}