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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5676a0ecb3c7eff4070ec70e62bc623b1f387612f01ee50628139aafc7af664' 
  AND token = 'pNyjGJv9moH6sct6tngljWZfB0adpEwKZYcTpGm3Kbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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