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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95263b2333a4b1fcbd5136ff5d874c2086d2fa50fe37b304ba062b6eb08fc5c3' 
  AND token = 'Ej1hb6RS5YJnNoocU5Ry5/d4b5JOdjTTVM7hIN8MsdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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