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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c25341e0c17af6ca2f5e19a073665ebd5aa23e809facab7213b32f281cdca96' 
  AND token = 'uDSRAsPt3+4gr9jLkrhdyjE0kpBpLFxFtxK/0bYyI8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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