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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b36e6ff278814229fac05b1915d7ba63b5533fe5f91d8bc8982034cf4e93321' 
  AND token = '6wOX9EJWfdLyM5F8OtEHA+6YyFu3ln+vAPin5bRj2AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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