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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2752a5bfac0f632675d5b0da19e6b3da26896e3cf01bd1e1eb4db700c93b48' 
  AND token = 'q1oaXZzWK5ZcKq2eto+zYJEcQSn4s9TCc7NuDjqY5ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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