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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090fc030f759ed05ba6924e88869282cae492760f84ca230ae9de265e1b1810c' 
  AND token = 'l7SzxG2RteEzW8zHxTRTeGlyjy0DxIsKliLN55nCg/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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