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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02922f75e950a5bcbbb90afcaf94dc9dbd79baef1cce119d5880701b4e3289c' 
  AND token = '0dNmxE6ADND39NVT40juowRXBlNE28ufFVNh5nx+eok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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