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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd2f7e4141f96bb14a8c5fcc7459d5b1e09e711c63eabb974dbe51a6884f1b8' 
  AND token = '5wNCV4VExdmeTJzVrN5ebiMH1ZjVr+GJQ6ZQxPDcVdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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