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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811c1ae85247febf67fc9e8a55d506f950091d70bad48a7efa892d82a593908e' 
  AND token = 'WVvhHgD8lLMjbB32yC8oIOK82qM0qItwiEBDZ+XY6fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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