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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550c8113932b17d152f9f218971a0ad551f475de5f952878f6ef0771f20c23b5' 
  AND token = 'mbNn9HBonyQrAnXC/C6gaVEqDolvUXOWmXbMe2P2mik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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