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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b905c3e8e8464fdae1f15d02da8c2bf117d8b566c23d9df51aff9a30a8580ee' 
  AND token = 'fSLVzdWux++Mhc9IF234b9UH1AcLHK9+cPEdVAptaqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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