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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e169a95b0b63824813c8b7bdcc1a051909734f1ed55fe621b1d10cd97d6f4e' 
  AND token = 'eKMea+ZwyUj1F3cwivQxfC0rZcTvs95Cv2EBUZZK/H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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