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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96041d668a80a918d97a9469d73e69484ed44253441f7e17a7e476f06db5e974' 
  AND token = 'rDNVuy44lzSNEGOIoib1Rh4tW0P0qCGiz7FT3BQikK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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