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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62a6550e6318b59e7141ae5acb2ceda447d0135d6da4ad4fc899718c9331534' 
  AND token = 'Zlkls6Leh/0CuYFza8ocDA6Naz8dccQhQBj4ePOzcX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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