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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bead157efd29272db6088e19bc0f27d9704d04ec1ddc333685e4c80e8dbab92' 
  AND token = 'Xfb+ROAU1+wqDEBNJ5rwtT8s3JKE78DvOfRSqNNsGU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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