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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2a74f77d0ffc9c8ef28c6b480435cae618974c9e3448342d1ad6a1d99e0cbd' 
  AND token = 'Vcs79tfjjOM5StE5MVnEB7pMHvYwcXp/Dwfwsy98QLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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