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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '483fcac75ee262cd6a0e9d0c1eb6200ce58747e55b01414e668beba18a3636a1' 
  AND token = 'D+OWkdiF8ue5UA9VeAY/FmoHJ/t8hGoVwVFN9mYki2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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