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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c960ae98e9c28dd8beca25a5431c3af5e1554ea49efb399c956b016ce86a96cf' 
  AND token = 'AuZj5OxW7GOBE+NojFUG+0Zqa2N16469e0qd+xH7kTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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