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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936fe493493c784f8843b1945b7ff69b20fb96ea1df0d9e7a4b59acb63154ab6' 
  AND token = 'lLvG7a5HWtyxPzOUVy56E0/xTQ1b7Q5usZoFsPNy8As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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