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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e04b692f04a534ab29c3fa26f800f2ab263e538ad247d284837a0eabf754d98' 
  AND token = '+dzQ0tdHYUuuwt9ZWK1OvSjXU6j2jptza5ZOEvxcpyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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