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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f87681a5a78d39846621196a7269ab1e828a0e9ce15547ab101acd3302c3da' 
  AND token = 'hQz5bpQkVPKVB61LCTuk9nc9yToY8kszxa3OYYtEm3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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