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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89fa2b767d5f19e030617b55d1c95cab91bb40536155cbddf99e84f92c83933f' 
  AND token = 'loruAb9Ylbqwd2AvX4soKaK8M4YnkQ5qcheIGy+9E2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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