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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3088767b3d7f5c211c1c7a2a76a13899e41c5d239564ee3a5f63de3d3ec061c8' 
  AND token = 'fqH65iiMwF3oIgpxfvkltzehNLVIBC9t7UWorqrynuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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