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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05a6146496f2054fa29aea52c262bf718e33909bc7b34a4eea548ae1222805f' 
  AND token = 'QreTolxhDFTTIA9kZt8c+Zox+9iIDv9X/jP+ouwXRDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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