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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37d5e5517a4f1fb2f4f332cd315fed9e18d6113c85d7557626036da1a5c1b9e' 
  AND token = 'd46RYEbcn/OVxC5lNe4UF6rk5kv9/XGjlyARFONCL6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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