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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977260d08fa22a6fe67ca7621759d7cc9935fae3707c3b47a98337a9a4d099f0' 
  AND token = 'C3nZuFCL/efMZceGu6m+nCTLW9YHGhuu57YUnA4emi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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