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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe21ef023390d7118811a6604d8a4f6c06b0752623daf6a3780a9480cdb99b6' 
  AND token = 'UaIJ99GqKs68dxkm8ejan13zBQcUK5TOSGbat8+zfEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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