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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c14b5a7f0283f717d302bbe40a1d3ef81018ab5f5d888a623ffbc5e9aba2ac' 
  AND token = '8QJSMnfX0ZApiCfNKc6DdYczpG/pVj2QwJna7Vg1Kno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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