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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9dd385bc69ae1ae8e1b1a3bc9b9edcdfea81e941e171308267449dfc207401' 
  AND token = 'Yb++L8lZzGY88TeeWeU8zL521f6TGs5aiamSGIystC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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