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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e52358ac3932be7cb6e2ac3a319d75518692e469ca988c911dc114c5101708' 
  AND token = 'bauhijLoYjicOm9yVNPP/xbZQr2eSbQhtDjNREcq8Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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