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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb4daffae0095c4e9c2b3dce3f4f7b7249749ba6da473c264e565a06f172eee' 
  AND token = 'gGnHI1x8oNidCwbesF+VGXvnTyHvvIs6FRMG7sz3VSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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