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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f9fc2613bcc96122107694df6fe24d33b1fa5b43c255ed6fa4dd26f3aa59e1' 
  AND token = '574vBssBntlmxroRQSXShlvo5hGda3Y4tCR4M2YOrnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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