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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8129ce99e55ccffa951c73c3194ac9a0884b47ee107a929e0d16e34730279bb' 
  AND token = 'v5mLGFt4vOv1sMXS2p5tyw91GVAW5YmFI21Hu2jK4jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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