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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6454d566832dc6e68716982a4eee183b0d0d3f9acc1a0730502f692729d4fd' 
  AND token = 'jgaYZ1X/dkyXjz3S5D1OsYymred69HUzkmHNzNWfJPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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