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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e074f135b354a1f4ecbe0003cd042b33d1b6134d773692c458a314c01d5d5908' 
  AND token = 'Rp8ocr1NcNCix8WieuqYXVBltPxeNyscYov3IIzogbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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