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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56d2197cece0f957df5bb47a8ddb6f72578b932b3d1afb275ceac409b059d2d' 
  AND token = 'pDxaQKM56blBxeJrMSgbsje4GDoLKnSRYLw8RLP0qqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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