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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16391924bad504d6b1d3d65dd1e1a6e62570810665611cc8c1c881da9118d816' 
  AND token = 'T/Odm8h9FxSr5kXsEgGGMjdfOicQfi7c9gWmnXoxlcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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