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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05d74b643338d74e84519e1e361a4bcca4ee1a36a619053ce092a9e9070800ce' 
  AND token = 'Cb30xN98r5oIB6UApfj8b0wIyRU2uRFKBBPOD9x4jUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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