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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32ee46b745d24b3b96cdf3d912633c383a5aa5d311dbeebd3af90a0985fc0bdf' 
  AND token = 'pAOwDUVPk4d6lsQFSE490mycHXtdyJ+cXHBuYwcZn8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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