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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14d8f0ccfd9df5391f5ccc03167c87db88270643ea2244db6fa635a7bdcef70' 
  AND token = 'lFO5davzjWZqq9HjGZ3J3akfOs9+W3F/QLupNSiaS+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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