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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f771f3c290e5f01903a7a9088e3b77db2d2e4cdb05095003789fef5d7d91840' 
  AND token = 'PVJKUqDV3WOUW/FELFrJKQKLm4wEcqU4ez/Y8iDAAH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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