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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746fc1a59cf8c51d7358e9e07bf7fc88240f77cddb04ae496ada6c93c134f92b' 
  AND token = 'oyMhtaBlqdEzoOse4xm97Gh5o32YciEe8V8Kk4x4JcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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