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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c8d4e7288d97e06be2f7dcee0508d4c25c3f227890336301dddfbe7bdd6f8ec' 
  AND token = 'S9iah8LhX4s61DkmiDx07B3Tzktfgjnb0J+4bK4x9+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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