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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e054d8bd82204b6d6e366b6a7f83afd82688c858e50d2586772a2f1df7191664' 
  AND token = 'ZlpPqyfBOjL1GhtjVpq2s0kYf1QG7FHR9wkNqtE5iEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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