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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '599250a6c04eebc42953e9528e4086c30a33018f05d8842dc6b2d1c0696cbf95' 
  AND token = 'wKmQaOtnwbxLhbjfPIf6hJA9eyU/rzw9qxQO0+wGGWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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