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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc8ef2ed8b87df74e4038839e9fd9a8bfe172966cf5ed005186c420ddaff60b' 
  AND token = 'wmGwYVtxvu9do6GQOcDfKB7PPBYt/Tp393kXm9+n54A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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