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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56afae7785c80c3fd2852ee79bfbca4eeb2661fad628c77e3d297bb0cb089ccb' 
  AND token = '1h4Gm/h+iH2moSEsb+PtYpTI4dzSKW0OE+O8VZzDBbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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