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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718093755a7d7db167e4418b6807bc89ca642bdd661be94f91268db44de79bd2' 
  AND token = 'Amgr+s/HGaRYwFdfzcyxhvQnim2/ycfnawe8BRcIDBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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