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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29b2c868aa32d32decb740448914988a98d49eb32da7713d7ecde13a29370647' 
  AND token = 'eV5d/uZ9oqob5HC2APt1D1k3niD4FTYY0fmoI41mlnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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