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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfe1ab61ca316a2af0ebb898e268e4815dc5e858c45b85daa4651e5cc599565' 
  AND token = 'szgkW1+LThl7e2KjpBNL6CLhc3dSvZE1IO/ssKHvsZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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