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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cca73679340a595706f6979f0091719c6a0f31b167abb6a735d8ad70ead0bc17' 
  AND token = 'kkAABPnrVutNyjwU2/zm3e2UMwf0a0DRnONCMLrI1SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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