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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b5ec117b32df692cd7955d29e932e00596e03f4f07985e9c3fd3e79d07f744' 
  AND token = 'SbPagKXhrIT28K7Et/ng1lPqybYldcSQxXX+dg3m0oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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