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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09558a1b49e7f07192c28ab87abbe0043c9f1d341b3844babf4501f35b54592' 
  AND token = 'HTATWjt2YSoUjvb/KU4a3BeGdZZjIRjcEHoNwX0r+wE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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