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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2ce7f1a7d1e8b9288831be185d6cd7c322725f14c4ab636264eb78ac14b177' 
  AND token = 'o4N7G63KKQq9J+31IgIg4sezSrgyDoVyK7l/FxdAOnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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