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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d96cd4b5d4cc26d72dac7bbcc08120a1f98b309c59821d8c4a2beda96570e51' 
  AND token = 'X2kfs6ZsqVSLzvS2f/3TlKMbXOCOktWTqSfG+LafWRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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