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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dde03bbc05e7116ee62cce0edfc660b1927ef1d8496f5a8b72cfe12d3e1f141' 
  AND token = 'b5bZdMYG8/cnX1MDASpqGwn3vYdemS34vlfEGkhb7C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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