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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e507dcab7674790393f1f611874cfde522acb91de6f38055f4a67464c08f2ee' 
  AND token = 'jgTgAvtFJ6olvo5UFxBLnWcGzyGgLLjGCvMIgBaEHN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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