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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67552ec389cd7f2cc8aafe3746b6430973d9172a81f5198b4c7cd892a704ab09' 
  AND token = '8bBEdZXghsyV753ptQtb8IvKDNkWOrdLE38wfEHcaqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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