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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae61438fb8ee6118e43a1cbdf7b934c7a2813cb2172983682e7dabe862b6cf7' 
  AND token = '4JaiKm/UZqKnWum12iRnxr8H72jpT55Xn8U2ODqZ/kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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