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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65078955a3f7b408d47d02020775c8e4544cf3f2fb2fabe947ac5f9aeff3773b' 
  AND token = 'KKB5kcSsUBkTYZExPAOwcM/xaDGczkPMyBdFe4G6v+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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