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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69eda75aa74ec1b48e17a0bb3bca7297472422ae50ac19c94fafd33939ad20d3' 
  AND token = '19Rybrsrga3P5hGshoNKfbOUwYkqmqVynofM1yFsbdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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