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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62dc49b2ffa501984928557a9b68d6ef9a9a9143834d1d5e9c5bf35cea1359a' 
  AND token = 'BNCOwyeKGArcY59hoCT3sI6eCFQwn3wkkeeUTc8USHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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