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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966155630e8b0e7f5fc86d85d41f2c517af74a5873564ce4ead1880e0ec81abc' 
  AND token = '1+iDOPVUWQl8skLSKvYpqI50taa2iIw5S9ZtF44uGvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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