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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00af12ea6f70149fa1e30df5c1bb3be1c953009c5fcbfd1ea3ca4d3eacc28de' 
  AND token = 'DW/SFSlY0caWUs0/F7Fe7ZsJvYZrlpZHgQuKyc0vWCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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