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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f847a2ac591d31edece52be1b93175e20e60e3ffc151b1786fa8a4af14857c' 
  AND token = 'TSrAg/xjheECkpdp8NpOP1Z/dPPH4cJQHm92kk6HEVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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